Q.Could you please tell me what is on the underside of the leaves, also on the stems?
they look like white grubs with heads, when touched the bodies feel like cotton fluff, they are on my Lacy Hydrangeas
Downtoearthdigs
Answered on June 21, 2019
These are Scale pests.
Treat with Neem Oil.
These links will help you.
https://www.gardeningknowhow.com/plant-problems/pests/insects/what-is-soft-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
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